1.Wide use,colorr choise 2.Non-toxic,environmental friendly 3.Qualified invisible ink,UV marker ink,invisible ink UV Invisible Ink&disappearing inkDescription1.high quality invisible ink .2.It's used for invisible pen.3.Words in this kind ink only can be seen under UV light4.It can be applied for any dry surface,eg,wood,glass,skin,metal etc,it will not hurt.